Added in API level 21

Summary: Ctors | Methods | Inherited Methods

MediaSession.Callback

---

Kotlin |Java

public static abstract class MediaSession.Callback
extends Object

java.lang.Object
↳	android.media.session.MediaSession.Callback

---

Receives media buttons, transport controls, and commands from controllers and the system. A callback may be set using MediaSession.setCallback(Callback).

Summary

Public constructors
Callback()

Public methods
void	onCommand(String command, Bundle args, ResultReceiver cb) Called when a controller has sent a command to this session.
void	onCustomAction(String action, Bundle extras) Called when a MediaController wants a PlaybackState.CustomAction to be performed.
void	onFastForward() Override to handle requests to fast forward.
boolean	onMediaButtonEvent(Intent mediaButtonIntent) Called when a media button is pressed and this session has the highest priority or a controller sends a media button event to the session.
void	onPause() Override to handle requests to pause playback.
void	onPlay() Override to handle requests to begin playback.
void	onPlayFromMediaId(String mediaId, Bundle extras) Override to handle requests to play a specific mediaId that was provided by your app's MediaBrowserService.
void	onPlayFromSearch(String query, Bundle extras) Override to handle requests to begin playback from a search query.
void	onPlayFromUri(Uri uri, Bundle extras) Override to handle requests to play a specific media item represented by a URI.
void	onPrepare() Override to handle requests to prepare playback.
void	onPrepareFromMediaId(String mediaId, Bundle extras) Override to handle requests to prepare for playing a specific mediaId that was provided by your app's MediaBrowserService.
void	onPrepareFromSearch(String query, Bundle extras) Override to handle requests to prepare playback from a search query.
void	onPrepareFromUri(Uri uri, Bundle extras) Override to handle requests to prepare a specific media item represented by a URI.
void	onRewind() Override to handle requests to rewind.
void	onSeekTo(long pos) Override to handle requests to seek to a specific position in ms.
void	onSetPlaybackSpeed(float speed) Override to handle the playback speed change.
void	onSetRating(Rating rating) Override to handle the item being rated.
void	onSkipToNext() Override to handle requests to skip to the next media item.
void	onSkipToPrevious() Override to handle requests to skip to the previous media item.
void	onSkipToQueueItem(long id) Override to handle requests to play an item with a given id from the play queue.
void	onStop() Override to handle requests to stop playback.

Inherited methods

From class java.lang.Object Object clone() Creates and returns a copy of this object. boolean equals(Object obj) Indicates whether some other object is "equal to" this one. void finalize() Called by the garbage collector on an object when garbage collection determines that there are no more references to the object. final Class<?> getClass() Returns the runtime class of this Object. int hashCode() Returns a hash code value for the object. final void notify() Wakes up a single thread that is waiting on this object's monitor. final void notifyAll() Wakes up all threads that are waiting on this object's monitor. String toString() Returns a string representation of the object. final void wait(long timeoutMillis, int nanos) Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed. final void wait(long timeoutMillis) Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed. final void wait() Causes the current thread to wait until it is awakened, typically by being notified or interrupted.

Public constructors

Callback

Added in API level 21

public Callback ()

Public methods

onCommand

Added in API level 21

public void onCommand (String command, 
                Bundle args, 
                ResultReceiver cb)

Called when a controller has sent a command to this session. The owner of the session may handle custom commands but is not required to.

Parameters
command	String: The command name. This value cannot be null.
args	Bundle: Optional parameters for the command, may be null.
cb	ResultReceiver: A result receiver to which a result may be sent by the command, may be null.

onCustomAction

Added in API level 21

public void onCustomAction (String action, 
                Bundle extras)

Called when a MediaController wants a PlaybackState.CustomAction to be performed.

Parameters
action	String: The action that was originally sent in the PlaybackState.CustomAction. This value cannot be null.
extras	Bundle: Optional extras specified by the MediaController. This value may be null.

onFastForward

Added in API level 21

public void onFastForward ()

Override to handle requests to fast forward.

onMediaButtonEvent

Added in API level 21

public boolean onMediaButtonEvent (Intent mediaButtonIntent)

Called when a media button is pressed and this session has the highest priority or a controller sends a media button event to the session. The default behavior will call the relevant method if the action for it was set.

The intent will be of type Intent#ACTION_MEDIA_BUTTON with a KeyEvent in Intent#EXTRA_KEY_EVENT

Parameters
mediaButtonIntent	Intent: an intent containing the KeyEvent as an extra This value cannot be null.

Returns
boolean	True if the event was handled, false otherwise.

onPause

Added in API level 21

public void onPause ()

Override to handle requests to pause playback.

onPlay

Added in API level 21

public void onPlay ()

Override to handle requests to begin playback.

onPlayFromMediaId

Added in API level 21

public void onPlayFromMediaId (String mediaId, 
                Bundle extras)

Override to handle requests to play a specific mediaId that was provided by your app's MediaBrowserService.

Parameters
mediaId	String
extras	Bundle

onPlayFromSearch

Added in API level 21

public void onPlayFromSearch (String query, 
                Bundle extras)

Override to handle requests to begin playback from a search query. An empty query indicates that the app may play any music. The implementation should attempt to make a smart choice about what to play.

Parameters
query	String
extras	Bundle

onPlayFromUri

Added in API level 23

public void onPlayFromUri (Uri uri, 
                Bundle extras)

Override to handle requests to play a specific media item represented by a URI.

Parameters
uri	Uri
extras	Bundle

onPrepare

Added in API level 24

public void onPrepare ()

Override to handle requests to prepare playback. During the preparation, a session should not hold audio focus in order to allow other sessions play seamlessly. The state of playback should be updated to PlaybackState#STATE_PAUSED after the preparation is done.

onPrepareFromMediaId

Added in API level 24

public void onPrepareFromMediaId (String mediaId, 
                Bundle extras)

Override to handle requests to prepare for playing a specific mediaId that was provided by your app's MediaBrowserService. During the preparation, a session should not hold audio focus in order to allow other sessions play seamlessly. The state of playback should be updated to PlaybackState#STATE_PAUSED after the preparation is done. The playback of the prepared content should start in the implementation of onPlay(). Override onPlayFromMediaId(String, Bundle) to handle requests for starting playback without preparation.

Parameters
mediaId	String
extras	Bundle

onPrepareFromSearch

Added in API level 24

public void onPrepareFromSearch (String query, 
                Bundle extras)

Override to handle requests to prepare playback from a search query. An empty query indicates that the app may prepare any music. The implementation should attempt to make a smart choice about what to play. During the preparation, a session should not hold audio focus in order to allow other sessions play seamlessly. The state of playback should be updated to PlaybackState#STATE_PAUSED after the preparation is done. The playback of the prepared content should start in the implementation of onPlay(). Override onPlayFromSearch(String, Bundle) to handle requests for starting playback without preparation.

Parameters
query	String
extras	Bundle

onPrepareFromUri

Added in API level 24

public void onPrepareFromUri (Uri uri, 
                Bundle extras)

Override to handle requests to prepare a specific media item represented by a URI. During the preparation, a session should not hold audio focus in order to allow other sessions play seamlessly. The state of playback should be updated to PlaybackState#STATE_PAUSED after the preparation is done. The playback of the prepared content should start in the implementation of onPlay(). Override onPlayFromUri(Uri, Bundle) to handle requests for starting playback without preparation.

Parameters
uri	Uri
extras	Bundle

onRewind

Added in API level 21

public void onRewind ()

Override to handle requests to rewind.

onSeekTo

Added in API level 21

public void onSeekTo (long pos)

Override to handle requests to seek to a specific position in ms.

Parameters
pos	long: New position to move to, in milliseconds.

onSetPlaybackSpeed

Added in API level 29

public void onSetPlaybackSpeed (float speed)

Override to handle the playback speed change. To update the new playback speed, create a new PlaybackState by using PlaybackState.Builder.setState(int, long, float), and set it with MediaSession.setPlaybackState(android.media.session.PlaybackState).

A value of 1.0f is the default playback value, and a negative value indicates reverse playback. The speed will not be equal to zero.

Parameters
speed	float: the playback speed

See also:

• MediaSession.setPlaybackState(PlaybackState)
• PlaybackState.Builder.setState(int, long, float)

onSetRating

Added in API level 21

public void onSetRating (Rating rating)

Override to handle the item being rated.

Parameters
rating	Rating: This value cannot be null.

onSkipToNext

Added in API level 21

public void onSkipToNext ()

Override to handle requests to skip to the next media item.

onSkipToPrevious

Added in API level 21

public void onSkipToPrevious ()

Override to handle requests to skip to the previous media item.

onSkipToQueueItem

Added in API level 21

public void onSkipToQueueItem (long id)

Override to handle requests to play an item with a given id from the play queue.

Parameters
id	long

onStop

Added in API level 21

public void onStop ()

Override to handle requests to stop playback.